Locomotive fire box



LE GRAND PARISH.

LOCOMOTIVE FIRE BOX.

APPLICATION FILED JUNEM 1919.

Pate rated Jan. 17,1922.

2 SHEETS-SHEET I.

WITNESS LE GRAND PARISH.

LOCOMOTIVE FIRE BOX.

APPLICATION FILED JUNE 4.1919.

1,403,81 6. Patented Jan. 17, 1922.

2 SHEETS-SHEET 2.

UNITEDSTATES PATENT OFFICE.

LE GRAND PARIS OEMOUNTAIN VIEW, NEW JERSEY.

Application filed June 4,

T 0 all whom it may concern:

' Be it known that I, LE GRAND PARISH, a citizen of the -United States, residing at Mountain View, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Locomotive F ire Boxes, of which the following is a specification.

This invention relates to locomotive fire boxes and particularly to an improved arrangement of the circulation tubes and refractory arches.

One of the primary objects of my invention is to increase the circulation through and the efiiciency of the boiler by employing a large number of circulation tubes, such tubes, however, being arranged in a manner whereby it is possible tohave ready access to the fines for purposes of inspection or repair and whereby the flexibility forcontraction and expansion of the fire box structure is not impaired.

Another object of the invention resides in the provision of an improved arrangement of circulation tubes of the character specified, whereby a plurality of refractory arches may be supported thereon in a manner to promote better combustion by securing an intimate admixture of the gases.

Still another object of my invention resides in an improved arrangement for supporting the arches carried by the circulating tubes.

The foregoing, together with such other objects as may hereinafter appear, or are incident to my invention, I obtain by means of a construction which I have illustrated in preferred form in the accompanying drawings wherein:

Figure l is a longitudinal section through a locomotive fire box embodying my improvements; Figure 2 is a cross section through the fire box illustrating the refractory arches in end elevation; Figure 3 is a section taken on the line 33 of Figure 1; Figure 4 is a section taken on the line 44 of Figure 1; and Figure 5 is a perspective view of a novel form of spacer brick which I employ in supporting the arch away from the throat sheet.

Referring now to Figure 1, the fire box comprises inside and outside throat sheets 7 and 8; inside and outside side sheets 9 and 10; inside and outside back sheets 11 and 12; a flue sheet 13 a crown sheet 1%; and a top Loco MorIvE FIRE BOX.

Specification-ofLetters Patent. Patented Jan 17 1922 1919. Serial No. 301,785.

sheet 15. The front and rear water legs are connected by a plurality of rearwardly and upwardly extending circulation tubes 16, arranged in two rows A and B, there being four tubes in the lower row A, and three tubes in the upper row B. The tubes are arranged in staggered relation and at their forward end they are expanded in the inside throat sheet in approximately the same plane (see Figs. 1, 2 and 4). In order to increase the vertical distance between the rows of tubes for a purpose which will appear, I spread the rows apart preferably by glving the upper row of tubes an upward bend, the bend extending approximately half the length of the tubes. Because of this arrangement of the tubes of the upper row, I construct the inside throat sheet with off-set portions or jogs 17 which present a securing wall extending substantially at right angles to the end port-ions of the upper row of tubes. One such off-set portion is provided for each of the upper tubes.

Supported on the upper row of tubes B is a. refractory arch C composed of two rows of arch bricks 18, which may be of any preferred construction. Supported between the side sheets and the outer tubes of the lower row A are side arches composed of a plurality of side or wing bricks 19. Two rows of arch bricks 20 are supported on the outer pairs of tubes of the lower row, the space between the center tubes of the lower row being left open so that a workman may gain access to the tines, without removing any portion of the arches, by taking either of the courses indicated by the arrows in Figure 3. The rows of tubes are spaced sufficiently far apart by the arrangement previously described to permit of the foregoing.

The staggered arrangement of the tubes is also of importance in this respect for the reason that it brings the end tubes of the upper row of bricks in toward the center, increasing the distance between the outer tubes and the side sheets.

It will be seen from the foregoing that I am enabled to greatly increase the circulation, and thus turn over the contents of the boiler more rapidly, by increasing the number of circulation tubes and this without detracting from the accessibility of the fiues or the flexibility for contraction and expansion of the fire box structure, in which latter respect it is to be noted that the construction of the upper rows of tubes is such that the tubes readily accommodate themselves to contraction and expansion. The peculiar arrangement of the tubes also permits of a special triangular disposition of the three arches as a result of which the gases are thoroughly admixed and better combustion promoted. My improvements, therefore, insure efficient operation of the boiler and economical consumption of fuel.

It will be observed that the construction of the upper tubes is such as to require additional means for supporting the arch carried thereon and to this endI provide the special brick illustrated. in Figures 4, and 5, particularly. In the lower face of these bricks D, I provide a. semi-circular groove 21 adapted. to fit the lower circulation tubes 16. The end faces 22 of the bricks are adapted to abut against the tubes of the upper row, the length of the bricks being sufiicient to permit of their insertion between pairs of tubes of the upper row. The bricks are also provided with an inclined surface 23 against which the lower or front course of the upper row of bricks is adapted to.

abut; and with an inclined surface 2% against which the forward or front bricks of the rows of bricks 20 are also adapted to abut. At the front the bricks are provided with a nos-e 25 adapted to bear against the inside throat sheet 7. By virtue of their construction the bricks D are securely locked in position between the tubes and are held against vertical disp-lacenientby reason of the weight of the arches.

It should be noted that no claim is made herein to the specific arch construction and arch brick arrangementand detail used in association with the herein-disclosed arch tube structure inasmuch as a divisional application bearing Serial No. 523,254, and a filing dateofDecember 19th, 1921, has been filed on this subject matter.

I claim:

1. A boiler fire box structure comprising in combination, a. shallow throat sheet and a rear water leg, a. plurality of circulation tubes connecting said throat sheet and said water leg, said tubes being arranged in spaced rows, the tubes of one row bein staggered with respect to the'other row and all of said tubes being connected to the throat sheet in substantially the same horizontal plane.

2. A boiler fire box structure comprising in combination, a shallow; throat sheet and I LE GRAND PARISH. 

